File:Streeter1917 fig01.jpg

Fig. 1. Median views of wax-plate models of the left membranous labyrinth in human embryos

Embryos have crown-rump lengths as indicated in the figure. The largest one is taken from Schonemann (’04) and represents the adult condition. They are all on the same scale of enlargement (4.4 diameters) and thus comparison of them shows graphically the amount of growth the labyrinth experiences during this period.

The actual amount of increase in size of the labyrinth is graphically pictured in figure 1. The outlines are made so that they show on the same scale of enlargement a series of wax-plate models of the left membranous labyrinth of human embryos having a crown-rump length of 20, 30, 50, 85 and 130 mm., as indicated in the figure. This covers the periodiduring which the otic capsule is in a cartilaginous state. Ossification begins when the fetus has attained a crown-rump length of about 130 mm.

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Reference

Streeter GL. The factors involved in the excavation of the cavities in the cartilaginous capsule of the ear in the human embryo. (1917) Amer. J Anat. 22: 1–25.

Cite this page: Hill, M.A. (2024, April 26) Embryology Streeter1917 fig01.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Streeter1917_fig01.jpg

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